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Loan Receivable - Summary of Information for Loan Receivable (Detail) - CAD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure of loan receivable [line items] |  |
Add: Accrued interest | $ 49 | $ 49
Loan receivable | 314 | 314
Evergreen Medicinal Supply Inc. [member] |  |
Disclosure of loan receivable [line items] |  |
Loan receivable excluding accrued interest | $ 265 | $ 265

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- Definition Disclosure of loans receivable [Line Items] + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Loan receivable gross. + References No definition available. + Details
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Namespace Prefix: | cron_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount of current loans and receivables. [Refer: Loans and receivables] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 8 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_8_c&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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Balance Type: | debit
Period Type: | instant

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- Definition The amount of interest income on loans and receivables. [Refer: Interest income; Loans and receivables] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |